Heating device for the dry spinning method of producing artificial threads



` May 12, 1931.

A. FRIEDERICH DEVICE FOR THE D RY SPINNING METHOD OF UCING ARTIFICIAL T Filed June 7. 1929 W @Ml 9M] wymqfwm/ e Patented May 12, 1931 UNITED STTS PATENT "OFFICE 'ALFRED' FRIEDERICI-I, OF BERLIN, GERMANY ASSIGNOR TOACETA Gr.y M. B. H., OF BER- LIN-LICHT'ENBECRG, GERMANY, A CORPORATION OE GERMANY HEATING DEVICE FOR DRY SPINNING METHOD F PODUCING ARTIFICIAL THREADS Application led June 7, 1929, Serial No. 369,219, and in Germany June 9, 1928.

The present invention relates to a process of heating spinning cells or shafts for spinning artificial threads according to the dry spinning process and to a device for per- .l forming the said process.

While spinning artificial threads according to the dry spinning method, it is necessary to maintain in all cells a uniform temperature, in order to avoid differences in 1o the vproperties of the threads obtained.

According to this invention, the heating of the spinning cells is effected by circulating a current of a heating medium in such a manner that it comes in contact successively with the upper part of each of the spinning cells and circulating a second current of the heating medium in such a manner that it comes in contact successively with the lower part of the spinning cells. The said currents of the heating medium are circulating separately from each other, care being taken,

that they are circulating in the opposite direction, in order to compensate the fall of temperature, which the heating medium suf- Vfers on its way from the first to the last spinning cell.

The following example may serve to illustrate the process above described, but is not intended to limit it thereto:

A number of spinning cells, the heating of the upper and lower ends oi each being eii'ected separately by means of a heating medium circulating in jackets surrounding the spinning cells is united to form an aggregate. In this aggregate a certain number of the jackets, surrounding the spinning cells, are connected with each other by means of tubes, as to form two or more series, for instance, the total number of the spinning cells may be halved. In each of the series the heating fluid is caused to traverse the jackets, surrounding the cells, one after the other. In this manner the heating fluid suii'ers between the first and the last cell a certain Vfall of temperature.

By using in the heating system, surrounding the lower ends oi" the spinning cells, a direction of current opposite to that in the heating system surrounding the upperr ends of the spinning cells, the said difference of temperature is compensated. The spinning cells, which in the upper system are receiving less heat in consequence of the temperature drop of the heating'fluid are the rst to be heated in the lower system and thereby receive the largest quantity of heat. Furthermore, by the division of theheating system in two systems, from which the one heats the'upper part and the other the lower part of the spinning cells, it is possible to heat Vthe different parts of the cells to different temperatures. f

The accompanying diagram illustrates an arrangement according to the invention. A large number of similarly constructed spinning shafts is united to form an aggregate and each shaft is surrounded in the upper part by a heating jacket a and in the lower part by a heating .jacket Y). The jackets a belong to the first heating system, the heating fluid in which is kept in circulation by the pump c. The heating yiuid enters first into the two end jackets of the system and then Hows through one half ofthe number of jackets in series, so that the two currents ultimately meet at the intake of the pump c. To allow of this iiow the'jackets are connected by the pipes e. In the second heating system the pump d delivers the heating Huid to the two middle jackets b and the two currents thien flow in opposite directions each through half the number of jackets in series, and finally leave the end jackets to unite at the intake of the pump. At any desired place in each circulation there is a heating device, not shown in the drawing, which contains vthe circulating fluid at the desired temperature.

In order to ensure an equal distribution of the circulating heating fluid through the two halves of each system there can be inserted in known manner a suitable reducing valve f in each branch of the circuit, which valve is so adjusted that its resistance is considerably greater than that of the pipes which are in: series with each other.

What I claim is An apparatus for spinning Y artificial threads according to the dry spinning methodV comprising in operative combination at least two spinning cells, the upper part as well as the lower part of each spinning cell, being provided each with a water jacket, means for connecting the upper ackets suc- 5 cessively, means for connecting the lower jackets successively, means for c1rculat1'ng a heating medium through the upper jackets and means for circulating the heating medium through the lower jackets in ODp0- site direction to that of the upper jackets.

In testimony whereof, I aix my signature.

ALFRED FRIEDERICH. Y

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